Acoustic Output Table With Hitachi Diagnostic Ultrasound System; Symbol Key - Olympus BF-UC180F Instructions Manual

Appendix C: Acoustic Output Information in Accordance with the FDA Guidance: "Information for Manufacturers
Acoustic output table with Hitachi diagnostic
ultrasound system
ULTRASONIC BRONCHOFIBERVIDEOSCOPE BF-UC180F
 Symbol key
MI Mechanical index.
TISscan Soft tissue thermal index in an autoscanning mode.
TISnon-scan Soft tissue thermal index in a non-autoscanning mode.
TIB Bone thermal index.
TIC Cranial thermal index.
A
Area of the active aperture (cm
aprt
p Derated peak rarefactional pressure (megapascals).
r0.3
W Ultrasonic power except for TISscan, in that case it is the ultrasonic
0
power passing through a one centimeter window (mW).
W Derated ultrasonic power at axial distance z
0.3
I Derated spatial peak, temporal average intensity at axial distance z
ta0.3 (z1)
z Axial distance corresponding to the location of max [min (W
1
I
ta0.3
z 1.69 (A
dp
for TIB, z
(centimeters)
d (z) Equivalent beam diameter as a function of axial distance z, and equal
ep
to [(4/) (W
a function of z.
fc The center frequency of the ultrasonic pulse.
Dim.of.A Active aperture dimensions for azimuthal and elevational planes
aprt
(centimeters).
PD Pulse duration.
PRF Pulse repetition frequency.
p at PII Peak rarefactional pressure at the point where the free-field,
r max
spatial-peak pulse intensity integral is a maximum (megapascals).
FL Focal length, or azimuthal and elevational length.
d at PII Equivalent beam diameter at the point where the free-field,
eq max
spatial-peak pulse integral is maximum.
2
(z ) × 1 cm )] where z >= Z
1
). For MI, z is the axtial distance at that p
arpt sp
is the axial distance at that TIB is maximum (z
sp
/I (z))], where I
0 ta ta
2
).
.
1
. (centimeters).
bp
r0.3
(z) is the temporal-average intensity as
.
1
(z ),
0.3 1
is measured;
= z )
sp p0.3
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